Add `bevy_transform_interpolation` to the README.md

[Shatur]

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 78.34%. Comparing base (aca414e) to head (967888f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #570   +/-   ##
=======================================
  Coverage   78.34%   78.34%           
=======================================
  Files          57       57           
  Lines        3187     3187           
=======================================
  Hits         2497     2497           
  Misses        690      690           

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

:rocket: New features to boost your workflow:

• :snowflake: Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[Shatur]

Converting into a draft since we might re-use this crate for interpolation on the client.